World: r4wp

you should know, that 'end is just a reference to still the same 
str, which can be proven, by inserting new element into str ....

Yes, index? does it! Thanks Pekr

end: find str "d"

==> search for "d" in the "abcdef" series in memory, then create 
a word! 'end that hold the position of "d" in this same serie.

>> insert str "0"
== "abcdef"
>> str
== "0abcdef"
>> end
== "cdef"

so 'str and 'end just hold different position in a unique string!

good point, DideC

Tried that myself, but no change in end, which Rebol version are 
you using?

Then, the 'for loop can work as it's positions in a unique serie!

2.7.8

Kees - beware - rebol series concept needs really carefull aproach 
- it caused me a headache when working with series, till I became 
accustomed to it. And still, sometimes, I use trial and error aproach 
in console ...

Kees - better start with a fresh session, fresh series ....

If I replace the text in str, end still equals to 
def", so it does not point
at str any more."
How do you replace the text in 'str ?

If it's like this:
	str: "new text"

then you have created a new string! in memory and point 'str to this 
new serie. 'str and 'end does not point anymore the same string!

try on one line in console:


>> str: "abcdef" end: find str "d" print end insert str "0" print 
end
def
cdef

Kees: there are 'replace and 'change functions ....

or:

>> str/3: #"1"
== #"1"
>> str
== "0a1cdef"

to change the content of the "abcdef" string! you create in first 
place you have to change it in some way.
Pekr used 'insert to add a character in the begining.
You can change all its content like this:
	insert clear str "new content"
then
	probe end
give
	" content"
So we have acted on the same string in memory.

Yes I see that now

Thank you both!

You may read the series page http://www.rebol.com/docs/core23/rebolcore-6.html

Thanks DideC, I will

Yes, that chapter is kind of ... essential imo :-)

If the two words represent the same string (but different position), 
then this will return true:

>> same? head str head end
== true

The key with series programming in Rebol is always "Is this the same 
serie or a new one ?"
Sometimes you want to act on the same.
sometimes you want to act on another.
FUNDAMENTAL

#[[DIdeC
str: "abcdef"

==> Create a string! in memory, put "abcdef" as its content, create 
a word! 'str an make it point to its head.
]]


- that is not true, in fact. The proper description is as follows:

    str: "abcdef"


is a Rebol source (or a part of it). That source is first processed 
by LOAD. LOAD creates the Rebol value representing "abcdef". Also, 
LOAD does *not* set the 'str value (yet).


Later on, when the DO function evaluates the (already LOAD-ed code), 
it just makes the 'str variable to refer to the string value not 
creating anything at all (this difference is crucial).

Dide, you should make sure you understand this difference.

There is even a possibility to write:

    end: #[string! "abcdef" 4]

I can give you a similar description as above even for this case, 
if you like.

Yes you are right.

Ladislav: "this difference is crucial" Could you please explain why 
this difference is important? Or better why it is important to understand?

I understand there is a big difference, but why it is important to 
know?

Endo, you may know this case:

my-code: [s: "" append s #"x"]

do my-code
do my-code ; == "xx"


my explanation is accurate for this case as well. You can see that 
the string (the "" value following the s: set-word) was created by 
LOAD only once, while append occurred twice expanding the string 
to contain "xx".

created by *LOAD* only once
, Ok I got it now. Thanks for the explanation.

I have a question about timezones. I need to make a selector for 
workonomic where user can set the TimeZone Like "Europe/Ljubljana" 
 instead of TZ offset which changes between summer/winter time depending 
on the timezone etc..

I assume rebol doesn't have "Labeled Timezon => current offset" capability 
so I am wondering if anybody had to do this and what (s)he found 
the best solution was? I see two ways, using external service in 
a lang that has such database/library (like php's ) or using the 
OS below (from bash) "TZ=":Pacific/Auckland" ; date +%z" ... also 
is there anything still I can do inside rebol, like getting some 
prefilled sqlite db using some lib I don't know of..

QTask may have solved this, and the source should be available somewhere. 
It might have been Bolek that worked on it, but I can't remember.

Yes, it's in Qtask source. I used a script to translate the TZ database 
to REBOL, then made a REBOL function to convert between timezones.


Note, if you are using MySQL, you can have it handle timezone conversions 
too.

Thanks Gabriele, I found by googling that mysql can have timezone 
database installed and has the functions to handle it then. http://stackoverflow.com/questions/805538/in-mysql-caculating-offset-for-a-time-zone
(the second answer, with a link of how to install if anyone else 
will be looking)

:)

I always found I was missing some foundation about this Rebol's behaviour. 
I have to note it elsewhere in my own documentation system as to 
be able to report it someday when I'll be publishing some formal 
learning material about Rebol, Red and other Rebol-inspired languages. 
Thanks.

>> import %./cURL-binding.so

** access error: cannot open: %./cURL-binding.so reason: "not found 
or not valid"

Sujoy, I've also had problems loading my cURL extension library

It seems to depend on the R3 version and the Linux system

Have you tried the latest community R3 build? If that doesn't work, 
perhaps Carl's last release?

These problems seem quite random, so I don't feel like doing more 
work on R3 extensions in C. I'm having similar problems with Red 
extensions for different R3 versions, but at least it solves most 
of the dependency problems with different Linuxes

If all else fails, you need to compile the cURL extension on your 
system from the C source code

You have a better chance of me seeing such a question if you pose 
it in !R3 Extensions

When R3 was open sourced, I presume the SDK was not also open sourced? 
I am looking for the 'C' source code for the RSA, AES and Blowfish 
encryption functions.

The SDK is only for REBOL2, which was not open sourced.

To find source codes, you will need to search with google or so. 
"blowfish source code c" first result looks promising http://www.schneier.com/blowfish-download.html